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| author | Craig Topper <craig.topper@gmail.com> | 2012-01-17 04:44:50 +0000 |
|---|---|---|
| committer | Craig Topper <craig.topper@gmail.com> | 2012-01-17 04:44:50 +0000 |
| commit | 37b10ef250d78aae674f5ff836271eced5da600d (patch) | |
| tree | e8e71481191e7224391b1e33111c812d3473beff /llvm/lib | |
| parent | b48ed1a4cb032b4cfe7d97db1d1429d1aa4a9860 (diff) | |
| download | bcm5719-llvm-37b10ef250d78aae674f5ff836271eced5da600d.tar.gz bcm5719-llvm-37b10ef250d78aae674f5ff836271eced5da600d.zip | |
Fix a crasher when PerformShiftCombine receives a BUILD_VECTOR of all UNDEF. Probably could use better handling in DAG combine or getNode. Fixes PR11772.
llvm-svn: 148285
Diffstat (limited to 'llvm/lib')
| -rw-r--r-- | llvm/lib/Target/X86/X86ISelLowering.cpp | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp index b5198c8510f..a0fd4316c38 100644 --- a/llvm/lib/Target/X86/X86ISelLowering.cpp +++ b/llvm/lib/Target/X86/X86ISelLowering.cpp @@ -13430,6 +13430,11 @@ static SDValue PerformShiftCombine(SDNode* N, SelectionDAG &DAG, BaseShAmt = Arg; break; } + // Handle the case where the build_vector is all undef + // FIXME: Should DAG allow this? + if (i == NumElts) + return SDValue(); + for (; i != NumElts; ++i) { SDValue Arg = ShAmtOp.getOperand(i); if (Arg.getOpcode() == ISD::UNDEF) continue; |
